CS609 FINAL TERM SOLVED PAPERS

CS609 FINAL TERM SOLVED PAPERS

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System Programming:

In the case of programmed I/O, the CPU continuously checks the I/O device to see if the I/O operation may or may not be performed. If I/O operations can be performed The CPU performs the calculations required to complete the I/O operation and then it will start waiting again until the I/O device is able to perform another I/O operation.

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CS609 FINAL TERM SOLVED PAPERS
CS609 FINAL TERM SOLVED PAPERS
CS609 FINAL TERM PAST PAPERS:

In the event of a controlled interrupt, the errors of the programmed controlled I/O are corrected. The processor does not check the I/O device for its ability to perform I/O rather, the operation of the I/O device informs the CPU that it is idle and can work An I/O operation that results in CPU execution being interrupted and an interrupt occurs A service routine (ISR) is called to perform the required calculations  /O operations.

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After executing the ISR, the CPU continues with what it was done before interrupting for an I/O operation. This way the CPU does not remain bound and can perform calculations for other processes during I/O devices are busy doing I/O and is, therefore, more optimal.

CS609 FINAL TERM SOLVED PAPERS:

t usually takes two bus cycles to transfer data from an I/O port to memory or on the contrary, if it happens through some register of the processor. This transmission time can be reduced by CPU bypass as ports and memory devices are also linked system bus. This is done with DMA controller support.

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